a:6:{i:0;s:8:"order_id";i:1;s:13:"delivery_time";i:2;s:7:"is_task";i:3;s:11:"finish_time";s:3:"_pk";s:8:"order_id";s:5:"_type";a:4:{s:8:"order_id";s:19:"bigint(20) unsigned";s:13:"delivery_time";s:16:"int(10) unsigned";s:7:"is_task";s:19:"tinyint(3) unsigned";s:11:"finish_time";s:16:"int(11) unsigned";}}